Effects of Cyclic Loading on the Shear Behaviour of Infilled Rock Joints Under Constant Normal Stiffness Conditions

Mirzaghorbanali, Ali; Nemcik, Jan; Aziz, Naj

doi:10.1007/s00603-013-0452-1

Cited by 61 publications

(7 citation statements)

References 18 publications

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“…Fractured rocks usually have the characteristics of high permeability, high heterogeneity, and strong anisotropy. In contemporary research, most scholars simplify this type of rock into a transversely isotropic body with fracture distribution, attach the fracture as a deterioration condition of the rock, and ignore the interface characteristics of the fracture surface [33]. Taking common igneous basalt as an example, the columnar jointed rock mass exposed in the field is a typical filled jointed rock mass and has physical and mechanical properties and permeability characteristics that have extremely strong anisotropy.…”

Section: Physical Properties Of Fractured Rocksmentioning

confidence: 99%

Study on Permeability Characteristics of Rocks with Filling Fractures Under Coupled Stress and Seepage Fields

Zhu

Niu

Que

et al. 2020

Water

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Infilling fractured rock masses are widely distributed in the deeply buried oil reservoirs and surrounding rocks of mine caves. The internal filling material has a great influence on the mechanical properties and seepage characteristics of fractured rock mass. In this paper, through theories and experiments, the mechanism of permeability changes of infilling fractured rock under a coupling condition is studied. In terms of theory, the fracture compaction effect coefficient δ is added to the classical matchstick model, and the volume strain principle is used to propose a permeability model for fractured rock. Furthermore, based on the Hertz contact theory, mineral particles are generalized into rigid spheres, and the mechanism of crack development between mineral particles under seepage pressure is analyzed. In terms of experiment, a true triaxial seepage test was carried out on rock-like specimens to obtain the change law of the permeability characteristics of fractured rock. The test results are largely consistent with the theoretical calculation results of the theoretical model, which verifies the applicability of the model proposed in this paper. After the loading failure of the specimen, the internal filling material was taken out and analyzed, and by observing the distribution of cracks on the surface, it is verified that the seepage pressure promotes the development of cracks in the filling fracture.

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Section: Physical Properties Of Fractured Rocksmentioning

confidence: 99%

Study on Permeability Characteristics of Rocks with Filling Fractures Under Coupled Stress and Seepage Fields

Zhu

Niu

Que

et al. 2020

Water

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“…Should be: Figure 4: Dilation and stress in cyclic shear test: a) cyclic reversible dilatancy, b) cyclic dilatancy degradation, c) experimental data [22] σ n , ε n…”

Section: Fig 4 Is Wrongmentioning

confidence: 99%

“…Changes in layer height are also related to the process of wear (attrition) of primary asperities. The wear function is formulated as: (20) where k is accumulated frictional work increment given by: (21) Asperity wear is described by: (22) Using the above relationship, the function describing the shape of asperity with respect to their wear was modified as:…”

Section: Frictional Wear and Asperity Degradationmentioning

confidence: 99%

Modelling of Rock Joints Interface under Cyclic Loading

Maciejewski¹,

Bąk

Ciężkowski

2020

Studia Geotechnica Et Mechanica

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The problem of numerical simulation of the material interface response under monotonic and cyclic loading is of fundamental scientific and engineering importance. In fact, such interfaces occur in most engineering and geotechnical structures. The present work is devoted to the deformational response analysis of contact interfaces under monotonic and cyclic loads. The class of materials includes rock and structural joints, soil structure interfaces, masonry and cementitious joints, localized shear bands and so on.The aim of the proposed model is to simulate the cyclic shear test under constant normal load. The associated dilatancy effect is associated with the configurational effects of asperity interaction or dilatancy of wear debris layer. The large primary asperities are assumed as responsible for interfacial dilation and small size asperities as governing frictional sliding and hysteresis response. The elliptic loading yield function is assumed to translate and rotate during progressive or reverse loading events. The model formulation is discussed and confronted with experimental data.

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“…Khosravi et al [8] used cylindrical plaster cast specimens containing oblique zigzag infilled joints to study the hydraulic fracture mechanism of infilled joints. Mirzaghorbanali et al [9] used clay-sand-filled model specimens to conduct a cyclic shear test under normal stiffness, based on which a mathematical model was proposed to evaluate the shear strength of infilled joints under the effect of cyclic shear load. Chen et al [10,11] studied the influences of joint goodness-of-fit on the joint transmission coefficient and the joint stiffness by grooving on a rock without considering the oblique incidence of stress waves.…”

Section: Introductionmentioning

confidence: 99%

Fluctuation Characteristic Test of Oblique Stress Waves in Infilled Jointed Rock and Study of the Analytic Method

Liu

et al. 2020

Advances in Civil Engineering

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The propagation of stress waves in filled jointed rocks involves two important influencing factors: transmission-reflection phenomena and energy attenuation. In this paper, the split Hopkinson pressure bar (SHPB) test is used to shock the filled rock with joint angles of 0, 30, and 45° and the thickness of 4 mm and 10 mm, respectively, in three different velocities. The wave curves of the incident wave, reflected wave, and transmission are obtained. The effects of the filling angle and joint thickness on wave propagation are analyzed. Based on the propagation characteristics of stress waves in joints, the stress expression of oblique incident stress waves propagating in filling joints is derived, and the energy coefficient of transmission and reflection is calculated. The results show that the propagation of stress wave in filling joints is related to the impact rate. The larger the impact rate is, the larger the maximum voltage amplitude of the three waves is. And the increasing amplitude of the incident and reflected waves is larger than the transmitted wave; the greater the impact velocity is, the smaller the stress-strain curve gap of the three dip joints is, and the fracture strength of the specimen decreases with the increase of the joint dip angle. The larger the joint dip angle is, the smaller the deformation of the rock-like specimen is. The change of the transmission coefficient is related to the joint angle, and the larger joint angle weakens the influence of the joint width on the transmission of the transmitted wave; under each impact velocity, the theoretical and experimental stress peaks are approximately the same, and the transmission coefficient maintains a good consistency with the oblique incident angle.

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Effects of Cyclic Loading on the Shear Behaviour of Infilled Rock Joints Under Constant Normal Stiffness Conditions

Cited by 61 publications

References 18 publications

Study on Permeability Characteristics of Rocks with Filling Fractures Under Coupled Stress and Seepage Fields

Study on Permeability Characteristics of Rocks with Filling Fractures Under Coupled Stress and Seepage Fields

Modelling of Rock Joints Interface under Cyclic Loading

Fluctuation Characteristic Test of Oblique Stress Waves in Infilled Jointed Rock and Study of the Analytic Method

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